Formula of modified styrene-butadiene rubber (SBR)

Abstract

The invention discloses a formula of modified styrene-butadiene rubber (SBR). The modified SBR comprises SBR and auxiliary additives, wherein the auxiliary additives comprise p-toluenesulfonhydrazide serving as a foaming agent, ethylene-vinyl acetate copolymer serving as a toughening agent, acrylate copolymer serving as an impact modifier, vinyltriethoxysilane serving as a coupling agent and a carbon fiber serving as a filling agent. After various modification aids are added into the SBR, the modified SBR has high flexibility and elasticity, and breaking elongation and tensile strength are improved; and in addition, an aid for improving reaction speed is added in the modification process, so that reaction time is greatly shortened, and processing cost is reduced.

Description

technical field [0001] The invention relates to a plastic formula, in particular to a formula of modified styrene-butadiene rubber. Background technique [0002] Generally, the mechanical properties of pure styrene-butadiene rubber are poor, and the effective reinforcing filler is carbon black, which limits the use of the product due to its dark color. In order to make light-colored products, silica, clay, etc. can generally be added, but the effect is not strong, and adding too much silica and clay will affect the physical properties of the product. Some people have used other polymers and styrene-butadiene rubber together to make it weaker, such as using short fiber to reinforce SBR, and using the system to increase the tensile strength, but it is not ideal, and the hardness is high and the elongation is low; High-strength SBR, and the tensile strength of the combined system is improved, but the resulting elastic body has large permanent deformation, low elongation at bre...

AI Technical Summary

Problems solved by technology

[0002] Generally, the mechanical properties of pure styrene-butadiene rubber are poor, and the effective reinforcing filler is carbon black, which limits the use of the product due to its dark color.

In order to make light-colored products, silica, clay, etc. can generally be added, but the effect is not strong, and adding too much silica and clay will affect the physical properties of the product

Some people have used other polymers and styrene-butadiene rubber together to make it weaker, such as using short fiber to reinforce SBR, and using the system to increase the tensile strength, but it is not ideal, and the hardness is high and the elongation is low; High-strength SBR, and the tensile strength of the system is improved, but the permanent deformation of the resulting elastic body is large, the elongation at break is low, and the processing temperature is high, and the process is complicated

In addition, the mechanical properties of the elastomer obtained by modifying SBR with high styrene resin are acceptable, but the hardness of the elastomer used together is high, the permanent deformation is large, and the processing temperature is also high, and the high styrene resin is expensive, and the cost cannot be passed.